Saturday, July 21, 2012

Adventures in Unconventional Propeller Flight

The Austrian D-Dalus design is meant to be the "hummingbird" of this class of unconventional rotor designs. Think of how maneuverable a hummingbird can fly, while still achieving a very high top speed.

The D-Dalus has the potential to be the "special ops" platform of choice for rapid insertions, extractions, and quick stealthy near ground-level attacks.
A flying machine with no airfoil, rotor or jet propulsion can travel where most cannot: in very tight spaces and through terrible weather.

ROTOR ASSEMBLIES

The craft’s four rotors spin at 2,200 rpm, and six blades attached to carbon-fiber disks create directional thrust. The blades act as mini airfoils, their angle of attack constantly shifting in relation to rotation. For vertical lift, a blade’s leading edge rises away from the center of the disk at the top of its rotation and toward the center of the disk at the bottom [pictured], creating a pressure differential.

FRICTIONLESS BEARINGS

Existing bearings were unable to withstand 1,000 Gs of force between the carbon-fiber disks and their blades and still deliver some degree of maneuverability. Engineers at IAT21 developed their own bearings, shaped like metal barrels, that hold up to the force better than spheres (think: arches) but can still roll enough for the blades to move. _Popsci


The Fanwing, seen below, is more of a slow semi-hovering craft, meant to linger overhead for extended periods of observational time. Fanwing is more of a recon aircraft.

Fanwing Simulation








The cycloidal drive propeller below was taken from an earlier marine drive -- used for tugboats and other highly maneuverable water craft.

When applied to a flying craft, the cycloidal drive has the potential to function as either a helicopter replacement, or as a drive for a larger airship or "blimp."



Cycloidal Drive Simulation


The Voith Schneider propeller (VSP), also known as a cycloidal drive (CD) is a specialized marine propulsion system (MPS). It is highly maneuverable, being able to change the direction of its thrust almost instantaneously. It is widely used on tugs and ferries.

From a circular plate, rotating around a vertical axis, a circular array of vertical blades (in the shape of hydrofoils) protrude out of the bottom of the ship. Each blade can rotate itself around a vertical axis. The internal gear changes the angle of attack of the blades in sync with the rotation of the plate, so that each blade can provide thrust in any direction, very similar to the collective and cyclic of helicopter flight controls. _ngcraft

Labels:

8 Comments:

Blogger retrodynamic said...

Technology Submission - State of the Art - Novel InFlow Tech - Featured Project Development;|/ ·1; Rotary-Turbo-InFlow Tech / - GEARTURBINE PROJECT Have the similar basic system of the Aeolipilie Heron Steam Turbine device from Alexandria 10-70 AD * With Retrodynamic = DextroRPM VS LevoInFlow + Ying Yang Way Power Type - Non Waste Looses *8X/Y Thermodynamic CYCLE Way Steps. Higher efficient percent. No blade erosion by sand & very low heat target signature Pat:197187IMPI MX Dic1991 Atypical Motor Engine Type. |/·2; Imploturbocompressor; One Moving Part System Excellence Design - The InFlow Interaction comes from Macro-Flow and goes to Micro-Flow by Implossion - Only One Compression Step; Inflow, Compression and outflow at one simple circular dynamic motion / New Concept. To see a Imploturbocompressor animation, is possible on a simple way, just to check an Hurricane Satellite view, and is the same implo inflow way nature.

7:34 PM  
Blogger Abina Ragav said...

This post is very useful to one and informative article i really impressed keep it up for most post selenium training in chennai

10:16 PM  
Blogger Aamala Ahona said...

All are saying the same thing repeatedly, but in your blog I had a chance to get some useful and unique information, I love your writing style very much, I would like to suggest your blog in my dude circle, so keep on updates.


Peridot Systems Chennai Contact Number

4:16 AM  
Blogger Aamala Ahona said...


A very nice guide. I will definitely follow these tips. Thank you for sharing such detailed article. I am learning a lot from you. Helpful as always. Every post you write produce a massive value to your readers that is the only reason it is so popular and has great authority.

Peridot Systems Chennai Reviews

12:18 AM  
Blogger Ridhima said...

Thanks for the good words! Really appreciated. Great post. I’ve been commenting a lot on a few blogs recently, but I hadn’t thought about my approach until you brought it up.

SEO training in Adyar

7:50 AM  
Blogger Ridhima said...


All are saying the same thing repeatedly, but in your blog I had a chance to get some useful and unique information, I love your writing style very much, I would like to suggest your blog in my dude circle, so keep on updates.


Java training in Adyar

7:53 AM  
Blogger Ridhima said...

That is very interesting; you are a very skilled blogger. I have shared your website in my social networks! A very nice guide. I will definitely follow these tips. Thank you for sharing such detailed article.


PHP training in Adyar

11:23 PM  
Blogger Aashi siva said...

Someone essentially lend a hand to make severely posts I would state. That is the very first time I frequented your website page and thus far? I surprised with the analysis you made to create this particular submit incredible. Fantastic job!

Online Training in Chennai

11:22 PM  

Post a Comment

<< Home

Newer Posts Older Posts